My grandpa was easy-going and more self-effacing than braggard. Except when he indulged in the effects of the shaman's potion. Then grandpa's male charm was pure macho mojo.
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My other grandpa also enjoyed a similar charm enhancer. It was no aphrodisiac though, it was simply the culinary mojo my other grandma cooked up for him. And no, these are not cojones, though Creadillas con Mojo may be a delicacy. More info here.

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Somehow "mojo" makes me think of "l'argot de Paris". Could it be Apache slang too? Info here.
